JP2003019919A - Infrared light irradiation lamp for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infrared light irradiation lamp relatively thinning red light emission of a front lens to prevent lighting of the lamp from being misconceived as a tail lamp and a stop lamp, by making a peripheral edge part of the lens emit white light and making slight outgoing of white light from in the vicinity of a lens central part. SOLUTION: In this infrared light irradiation lamp, comprising a vessel-shaped lamp body 12, a lens 14 assembled to a front opening part of the lamp body 12 to partition a lamp chamber in cooperation with the lamp body 12, a reflector 16 provided inside the lamp body 12, a light source 18 provided in the forward of the reflector 16, and an infrared light transmissive film 22 reflecting a visible light component of make an infrared light component transmit, an infrared light transmissive film non-formed region 24 is provided in the external periphery of the infrared light transmissive film 22, light source light not transmitting the infrared light transmissive film 22 is guided to a peripheral edge part 14a of the lens, the peripheral edge part 14a in a region emitting red light of the lens 14 emits white light, red light emission is relatively thinned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared ray irradiating lamp for an automobile, which is mounted on an automobile and illuminates the front of the vehicle with infrared rays, and particularly to a CC having a sensitivity up to near infrared rays.
The present invention relates to an infrared light irradiation lamp for automobiles shared with a D camera.

[0002]

2. Description of the Related Art For example, in a lamp of this type, a visible light source and a parabolic reflector are arranged in a lamp chamber defined by a lamp body and a front lens to reflect a visible light component and transmit an infrared light component. An infrared light transmission filter (hereinafter simply referred to as an infrared light transmission film) formed on the entire surface of the glass plate is placed between the light source and the front lens so as to block the entire front opening of the lamp chamber. However, all of the light source light that goes to the front lens is configured to pass through the infrared light transmissive film, and the light source light reflected by the reflector is cut into visible light components when passing through the infrared light transmissive film. Then, the light mainly consists of the invisible infrared light component and is emitted and distributed forward from the front lens.

The infrared irradiation area in front of the vehicle is a CCD provided in the front of the vehicle and having sensitivity up to the near infrared.
The image is taken by the camera, processed by the image processing device, and displayed on the monitor screen in the passenger compartment. The driver can see people, lane marks, obstacles, etc. far away on the monitor screen that shows the field of view in front of the vehicle.

[0004]

However, in the above-mentioned conventional infrared light irradiation lamp, the infrared light transmission filter (infrared light transmission film) has a long wavelength side visible light (red light component) around 700 to 800 nm. ) Can not be completely cut, the visible light (red light component) part of the infrared light transmitted through the infrared light transmission filter (infrared light transmission film) is also guided to the front lens. Then, a part of visible light (red light component) is emitted together with the infrared light from the front lens, and it appears that the front lens emits red light (lamp lights red).
For this reason, the lighting of the infrared light irradiation lamp provided in the front part of the automobile may be mistaken for the lighting of the tail lamp or the stop lamp, which is a safety problem.

Therefore, the inventor guides a part of the light from the light source to the peripheral portion of the front lens without passing through the infrared light transmitting filter (infrared light transmitting film), so that the peripheral portion of the front lens emitting red light is guided. As a result of repeated experiments, it was confirmed that this is extremely effective when white light is emitted, so that red light is diminished and becomes inconspicuous, so that the present invention has been proposed. .

The present invention has been made on the basis of the above-mentioned problems of the prior art and the knowledge of the inventor. The purpose of the present invention is to cause the peripheral portion of the lens to emit white light or to emit white light from the central portion of the lens. It is intended to provide an infrared irradiation lamp in which the red light emission of the front lens is relatively diluted by slightly emitting the light, and the lighting of the lamp is not mistaken for a tail lamp or a stop lamp.

[0007]

In order to achieve the above object, in the infrared light irradiating lamp according to claim 1, a container-shaped lamp body and a front opening of the lamp body are assembled, For a vehicle including a lens that cooperates with a lamp body to define a lamp chamber, a reflector provided inside the lamp body, a light source provided in front of the reflector, and an infrared light transmitting film. In an infrared light irradiation lamp, the outer periphery of the infrared light transmission film and / or
Alternatively, the infrared light transmitting film non-formation region is provided in the infrared light transmitting film. (Function) The light source light reflected by the rear reflector is transmitted through the infrared light transmitting film in front of the reflector, so that the visible light component is cut, and it is mainly emitted as an invisible infrared light component from the lens. To do. However, the light emitted from the lens also contains a visible light component (red light component) that cannot be completely cut by the infrared light transmitting film, and therefore the lens emits red light when the lamp is lit. However, in the structure in which the infrared light transmitting film non-forming area is provided around the outer periphery of the infrared light transmitting film, the infrared light transmitting film is formed in the peripheral portion of the lens through the infrared light transmitting film non forming area. Since the light from the light source that does not pass through the lens is guided, the peripheral portion of the lens emits white light and acts to dilute the red emission color of the lens. Further, in the structure in which the infrared light transmissive film non-forming region is provided in the infrared light transmissive film, the light source light that is guided through the infrared light transmissive film non-forming region and does not pass through the infrared light transmissive film is a lens. Emitting slightly from near the center,
It acts to dilute the red emission color of the lens. That is, the amount of red light emitted from the lens is almost the same as in the case of the conventional structure in which all the light source light directed to the lens is transmitted through the infrared light transmitting film, but the periphery of the region of the lens that emits red light The part emits white light, or a small amount of white light is emitted from the vicinity of the center of the lens, whereby the red light emission is relatively diluted.

As the infrared light irradiation lamp,
The parabolic reflector reflects the light from the light source into almost parallel light, and the diffused light is distributed in the front lens light distribution control step, or the light source is reflected by a reflector equipped with multiple split reflection surfaces for continuous light distribution control. Consists of a reflection illumination optical system that diffuses and diffuses light, and a projection illumination optical system that reflects the light from the light source by an ellipsoidal reflector and then collimates and distributes the light using a projection lens. There are various forms, and any form can be applied.

According to a second aspect, in the infrared light irradiation lamp according to the first aspect, a transparent member is provided between the reflector and the lens, and the infrared light transmitting film is formed on the transparent member. Configured. (Function) With a simple configuration in which an infrared light transmission filter (transparent member having an infrared light transmission film formed) is arranged between the reflector and the lens, for example, visible light cut of the infrared light transmission filter (infrared light transmission film) If the performance deteriorates due to high temperature, it is sufficient to replace only the infrared light transmitting filter without replacing the main parts of the lamp.

According to a third aspect of the present invention, in the infrared light irradiation lamp according to the first aspect, the infrared light transmitting film is formed on the lens. (Operation) Since the infrared light transmitting film is formed directly on the lens, a transparent member for forming the infrared light transmitting film is unnecessary, and the lamp structure is simple accordingly. Further, as compared with the case where an infrared light transmitting filter (a transparent member having an infrared light transmitting film formed) is provided, heat is less likely to stay in the lamp chamber, and thermal deterioration of the infrared light transmitting film is suppressed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described based on Examples.

FIGS. 1 and 2 show a lamp which is used, for example, in combination with an infrared light compatible CCD camera which is provided in the upper part of the vehicle compartment and photographs the field of view in front of the vehicle, and is suitable for application to a night-time forward field-of-view detection system. 1 shows an embodiment of an infrared light irradiation lamp, FIG. 1 is a vertical sectional view of an infrared light irradiation lamp which is a first embodiment of the present invention, and FIG. 2 is a rear view of an infrared light transmission filter which is a main part. is there.

The night-time front view detection system includes an infrared light irradiation lamp 10A provided in the front part of the vehicle for irradiating the front of the vehicle with infrared light, and a red view lamp provided, for example, in the upper part of the passenger compartment for photographing the view in front of the vehicle. CCD camera for external light (not shown)
And an image processing analysis device that analyzes an image captured by the CCD camera, a head-up display (HUD) that displays data analyzed by the image processing analysis device, and the like.

An image of a pedestrian, an obstacle, a lane mark, etc., which cannot be seen by the CCD camera, is sent to the image processing and analysis device, and edge processing and pattern recognition are performed from the image. You can easily recognize pedestrians, obstacles, and lane marks. And images of pedestrians, obstacles and lane marks,
The head-up display (HUD) is used to show the driver, the features of a road object (pedestrian, obstacle, lane mark, etc.) can be determined by shape recognition, and the driver can be notified by voice.

As shown in FIG. 1, the infrared light irradiation lamp 10A is assembled in a container-shaped synthetic resin lamp body 12 and a front opening of the lamp body 12, and cooperates with the lamp body 12 to generate a lamp. Front lens 14 that defines chamber S
A parabolic reflector 16 integrally formed on the inner peripheral surface of the lamp body 12, and a halogen bulb 18 which is a light source inserted into a bulb insertion hole 12a provided at the rear top of the lamp body 12. And an infrared light transmission filter 20 arranged so as to extend across the front of the reflector 16. The front lens 14
A cylindrical step 15 for light distribution control that diffuses and distributes the light source light in a predetermined direction is provided on the back surface side of the.

As shown in FIG. 2, the infrared light transmitting filter 20 has a structure in which an infrared light transmitting film 22 is formed on the surface of a transparent glass plate 21, and has a peripheral edge of the infrared light transmitting filter 20 (glass plate 21). The portion is provided with a ring-shaped infrared light transmissive film non-forming region 24A having a predetermined width. That is, the infrared light transmissive film 22 is formed on the rear surface of the glass plate 21 except for the peripheral region of a predetermined width.

As shown in FIG. 1, the infrared light transmitting filter 20 has its peripheral portion at the lamp body 12 and the front lens 1.
It is positioned and fixed in the lamp chamber S by engaging with the groove 13 formed in the engaging portion between the four. That is, the front lens 14 can be assembled to the lamp body 12 and at the same time, the infrared light transmission filter 20 can be fixed in a sandwiched manner, which is convenient when the infrared light transmission filter 20 is replaced.

When the lamp is turned on, the light from the light source reflected by the reflector 16 is reflected by the infrared light transmitting filter 20 (the infrared light transmitting film 22 of the infrared light transmitting filter 22 as shown by reference numeral L1 in FIG. 1).
The visible light component is cut off by passing through () to become an invisible infrared light component, which is emitted from the front lens 14. However, the light emitted from the front lens 14 also includes a visible light component (red light component) that cannot be completely cut by the infrared light transmitting film 22, and therefore the front lens 14 when the lamp is lit up is It glows red. However, in the peripheral portion of the front lens 14, as shown by reference numeral L1 ′ in FIG. 1, the infrared light transmitting film 22 is formed via the infrared light transmitting film non-forming region 24A.
Since the light source light that does not pass through is guided, the peripheral portion 14a of the front lens 14 emits white light, and acts to dilute the red emission color of the front lens 14. That is, the front lens 14
The amount of red light emitted from the front lens 14 is almost the same as in the case of the conventional structure in which all the light source light traveling toward the front lens 14 is transmitted through the infrared light transmitting film 22.
The peripheral portion 14a of the region that emits red light emits white light, whereby the red light is relatively thinned.

FIG. 3 is a vertical sectional view of an infrared light irradiation lamp which is a second embodiment of the present invention.

In the above-described first embodiment, the infrared light transmitting filter 20 is provided in the front opening of the lamp body 12 so as to close the lamp chamber S, and the infrared light transmitting film 22 is provided on the periphery of the glass plate 21. Although the infrared light irradiating lamp 10B shown in this embodiment is formed with an extra portion, the infrared light transmitting filter 20A in which the infrared light transmitting film 22 is formed on the entire back side of the glass plate 21 is used in the lamp chamber. It is arranged and fixed so that a predetermined gap (infrared light transmitting film non-forming region 24B) is formed between the inner peripheral surface of S and the inner peripheral surface of S. That is, engaging projections 23 are provided at a plurality of positions in the circumferential direction of the infrared light transmitting filter 20A, and the infrared light transmitting filter is provided in the groove 13 formed in the engaging portion between the lamp body 12 and the front lens 14. Two
The infrared light transmitting filter 20A is positioned and fixed in the lamp chamber S by the engagement of the engagement protrusion 23 on the 0A side.

When the lamp is turned on, the light from the light source reflected by the reflector 16 is reflected by the infrared light transmitting filter 20A (the infrared light transmitting film 2 of the infrared light transmitting filter 20A, as shown by L2 in FIG. 2).
2) is cut, the visible light component is cut off, and it is mainly emitted as an invisible infrared light component from the front lens 14. However, in the light emitted from the front lens 14,
A visible light component (red light component) that cannot be completely cut by the infrared light transmitting film 22 is also included, and therefore the front lens 14 emits red light when the lamp is lit. However, in the peripheral portion of the front lens 14, as shown by reference numeral L2 ′ in FIG.
Light from the light source that does not pass through the infrared light transmitting film 22 is guided through the gap (infrared light transmitting film non-forming region 24B), and the peripheral portion 14a of the front lens 14 emits white light, and the front lens 14
The red emission color of is diminished and is inconspicuous.

Further, the lamp chambers S partitioned by the infrared light transmitting filter 20A in the front and back are communicated with each other by the gap between the peripheral edge of the infrared light transmitting filter 20A and the wall surface of the lamp chamber,
Air convection is generated across the front and rear lamp chambers via this gap, and heat is suppressed from being trapped in the lamp chamber S.

FIG. 4 is a vertical sectional view of an infrared light irradiation lamp according to the third embodiment of the present invention.

In the infrared light irradiation lamp 10C shown in the third embodiment, the reflector 16A has a plurality of continuous divided reflection surfaces 17 for controlling light distribution, and the plurality of divided reflection surfaces 17 of the reflector 16A are used. The front lens 14 is provided with a reflection type illumination optical system that forms a predetermined light distribution by diffuse reflection light.
A is formed on the plain surface on which the step 15 for controlling the light distribution as shown in the first embodiment is not formed.

Further, the infrared light transmitting film 22 is directly formed on the rear surface side corresponding to the design surface of the transparent front lens 14A, and a strip of a predetermined width is formed inside the lens side wall which is the peripheral portion of the front lens 14A. Infrared light transmitting film non-forming region 24C is provided.

When the lamp is turned on, the light source light reflected by the reflector 16A is transmitted through the infrared light transmitting film 22 to cut the visible light component, as shown by L3 in FIG. The infrared light component invisible to the eye is emitted from the front lens 14. However, this front lens 1
Since the emitted light from 4A also includes a visible light component (red light component) that cannot be completely cut by the infrared light transmitting film, the front lens 14 emits red light when the lamp is lit. However, in the peripheral portion of the front lens 14A, reference numeral L in FIG.
As shown in 3 ', since the light source light that does not pass through the infrared light transmitting film 22 is guided through the infrared light transmitting film non-forming region 24C, the peripheral portion 14a of the front lens 14A emits white light and the front surface The red emission color of the lens 14A is dimmed and is inconspicuous.

FIG. 5 is a vertical sectional view of an infrared light irradiation lamp according to a fourth embodiment of the present invention.

In the above-described first to third embodiments, the light source light is reflected by the parabolic reflector 16 and becomes substantially parallel, and the light is diffused or distributed in the light distribution control step of the front lens 14.
Reflector 1 having a plurality of continuous divided reflection surfaces 17
The infrared illumination lamp 1 shown in the fourth embodiment is composed of a reflection type illumination optical system that diffuses and diffuses light at 6A.
In 0D, the projection type illumination optical system is configured to project and distribute the light source light reflected by the ellipsoidal reflector 16B into substantially parallel light by the projection lens 40.

That is, the filament of the halogen bulb 18 is arranged so that the filament of the halogen bulb 18 is located at the first focal point f1 of the metallic ellipsoidal reflector 16B that is the lamp body 12, and the reflector 16B has a cylindrical shape that is the lamp body 12. The metal lens holder 30 is fixed, and the projection lens 40 is fixedly held in the front opening of the lens holder 30 by the annular lens holding frame 36 having an L-shaped cross section. Reference numeral 32 is a stepped portion that is provided around the inner peripheral edge of the front opening of the lens holder 30 and carries the flange portion 41 of the lens 40. Then, the light source light reflected by the reflector 16B is condensed at the second focal point f2 of the reflector 16B, and then is converted into light substantially parallel to the optical axis of the reflector 16B by the front projection lens 40, as indicated by symbol L4. The light is projected and distributed forward.

A ring-shaped step portion 32A for carrying a filter is formed on the inner peripheral edge of the step portion 32 for carrying a lens formed in the front opening of the lens holder 30. The infrared light transmission filter 20B housed in the step portion 32A is fixedly held in the front opening of the lens holder 30 integrally with the projection lens 40 by the lens holding frame 36. Reference numeral 26 denotes a rubber material provided around the peripheral edge of the infrared light transmitting filter 20B. The infrared light transmitting filter 20B and the projection lens 40 are made of this rubber material 2.
They are spaced apart by a thickness corresponding to 6.

The infrared light transmitting filter 20B includes the first
Similar to the infrared light transmitting filter 20 described in the embodiment of
The transparent glass plate 21 has a structure in which an infrared light transmitting film 22 is formed on the surface excluding the peripheral portion on the back side. The infrared light transmitting filter 20B (glass plate 21) has a ring-shaped infrared light having a predetermined width on the peripheral portion. A light transmission film non-formation region 24D is provided.

When the lamp is turned on, the light source light reflected by the reflector 16B passes through the infrared light transmission filter 20B (the infrared light transmission film 22 of the infrared light transmission filter 20B) as shown by L4 in FIG. As a result, the visible light component is cut, and the infrared light component that is mainly invisible is emitted from the projection lens 40. However, the emitted light from the projection lens 40 also contains a visible light component (red light component) that cannot be completely cut by the infrared light transmitting film, and therefore the projection lens 40 is red when the lamp is on. It emits light. However, as shown by reference numeral L4 ′ in FIG.
Since the light source light that does not pass through the infrared light transmitting film 22 is guided through the infrared light transmitting film non-forming region 24D, the peripheral edge portion 40a of the projection lens emits white light, and the projection lens 40 emits red light. Is diluted and is inconspicuous.

Further, the filter 20B is provided at a position sufficiently separated from the second focus position f2 where light is condensed and becomes high temperature, and the infrared light transmitting film 22 is less likely to be thermally deteriorated.

FIG. 6 is a perspective view of a main part of an infrared light irradiation lamp according to the fifth embodiment of the present invention.

In the above-described fourth embodiment (see FIG. 5), the infrared light transmitting filter 20B having the infrared light transmitting film non-forming region 24D provided in the peripheral portion is arranged so as to close the lamp chamber S1. That is, although the peripheral edge of the infrared light transmitting filter 20B is provided in contact with the inner peripheral surface of the lens holder 30, the glass plate 21 is used in the infrared light emitting lamp 10E shown in the fifth embodiment. The infrared light transmitting filter 20C in which the infrared light transmitting film 22 is formed on the entire back surface side of
The peripheral portion is arranged slightly apart from the inner peripheral surface of the lens holder 30, and an infrared light transmitting film non-forming region 24E is provided on the outer periphery of the infrared light transmitting filter 20C.

That is, inward projections 32B with a stepped portion for carrying a filter are provided at three locations in the circumferential direction of the stepped portion 32 for carrying a lens formed in the front opening of the lens holder 30.
Are formed. By accommodating the infrared light transmitting filter 20C in the inner protrusion 32B, a gap (infrared light transmitting film non-forming region 24E) is formed around the outer periphery of the infrared light transmitting filter 20C. Then, as in the fourth embodiment, the lens holding frame 36 causes the projection lens 40
The infrared light transmitting filter 20C and the infrared light transmitting filter 20C are integrally fixed and held in the front opening of the lens holder 30. Reference numeral 27 denotes a rubber material provided on the peripheral portion of the infrared light transmission filter 20B corresponding to the inward projection 32B.
0C and the projection lens 40 are spaced apart by a distance corresponding to the thickness of the rubber material 27.

When the lamp is turned on, the light source light reflected by the reflector 16B is transmitted through the infrared light transmission filter 20C (through the infrared light transmission film 22) to cut the visible light component, The invisible infrared light component is mainly emitted from the projection lens 40. However, the light emitted from the projection lens 40 also contains a visible light component (red light component) that cannot be completely cut by the infrared light transmitting film,
Therefore, the projection lens 40 emits red light when the lamp is lit. However, in the peripheral portion of the projection lens 40, a ring-shaped gap (infrared light transmitting film non-forming region 24) between the inner peripheral surface of the lens holder 30 and the peripheral portion of the infrared light transmitting filter 20C is formed.
Since the light source light that does not pass through the infrared light transmitting film 22 is guided through E), the peripheral edge portion 40a of the projection lens emits white light, and the red emission color of the projection lens 40 is diminished and inconspicuous.

Further, the front and rear lamp chambers partitioned by the filter 20C communicate with each other through the gap 24E between the filter 20C and the lens holder 30, and air convection is generated between the front and rear lamp chambers through this gap. Therefore, heat is not accumulated in the lamp chamber, and thermal deterioration of the infrared light transmitting film 22 is suppressed.

FIG. 7 is a vertical sectional view of an infrared light irradiation lamp according to a sixth embodiment of the present invention.

Infrared light irradiation lamp 10F shown in this embodiment
The infrared light transmitting film 22 is directly formed on the back surface side of the projection lens 40, and a band-shaped infrared light transmitting film non-forming region 24F having a predetermined width is provided on the peripheral portion of the back surface of the projection lens 40. .

When the lamp is turned on, the light source light reflected by the reflector 16B is transmitted through the infrared light transmitting film 22 on the back side of the projection lens 40 as shown in L6 of FIG. The components are cut and mainly become invisible infrared light components, which are emitted from the projection lens 40. However, in the light emitted from the projection lens 40, a visible light component (red light component) that cannot be completely cut by the infrared light transmitting film 22.
Therefore, the projection lens 40 emits red light when the lamp is turned on. However, since the light source light that does not pass through the infrared light transmitting film 22 is guided to the peripheral portion of the projection lens 40 via the infrared light transmitting film non-forming region 24F, as shown by reference numeral L6 ′ in FIG. The peripheral edge portion 40a of the projection lens emits white light, and the red emission color of the projection lens 40 is dimmed to be inconspicuous.

8 and 9 show a seventh embodiment of the present invention, FIG. 8 is a longitudinal sectional view of the infrared light irradiation lamp, and FIG. 9 is an exploded perspective view of a main part of the lamp.

Infrared light irradiation lamp 10G shown in this embodiment
In, the infrared light transmitting film 22 is formed on the area other than the flange portion 41 on the back surface of the projection lens 40. That is,
The infrared light transmitting film 22 is formed on the back surface of the projection lens 40 corresponding to the bulging lens portion 42, and the flange portion 41 of the projection lens 40 is provided with the infrared light transmitting film non-forming region 24G.

On the other hand, in the front opening of the lens holder 30, the inner peripheral edge is notched into three taper portions in the circumferential direction, and three portions carrying (the flange portion 41 of) the projection lens 40 are carried. The step portion 32C is provided so that the light source light that does not pass through the infrared light transmitting film 22 is guided to the flange portion 41. Reference numeral 33 indicates a tapered surface.

Further, the lens holding frame 36A fixed to the front edge of the lens holder 30 and fixedly holding the flange portion 41 of the projection lens 40 has its inner peripheral edge portion divided into three equal parts in the circumferential direction.
The part is cut out in an arc shape, and three claws 37 corresponding to the step portion 32A of the lens holder 30 are provided,
As a result, the light source light guided to the flange portion 41 is emitted forward without being blocked by the lens holding frame 36A. Reference numeral 38 indicates a notch in the inner peripheral edge of the lens holding frame 36A.

Then, in the same lamp at the time of lighting, the light source light reflected by the reflector 16B is transmitted through the infrared light transmitting film 22 as shown by reference numeral L7 in FIG. The infrared light component invisible to the eye is emitted from the projection lens 40. However, the light emitted from the projection lens 40 also contains a visible light component (red light component) that cannot be completely cut by the infrared light transmitting film 22, and therefore the projection lens 40 when the lamp is lit up It glows red.
However, from the flange portion 41 of the projection lens 40, as shown by reference numeral L7 ′ in FIG.
4G is transmitted, the step portion 32C and the lens holding frame 36A
Since the light source light (light source light that does not pass through the infrared light transmitting film 22) that is not shielded by (the nail 37) is emitted, the peripheral edge portion 41 of the projection lens 40 emits white light and the red light of the projection lens 40 The emission color is dimmed and it is inconspicuous.

Although the infrared light transmitting film is formed on the back side of the glass plate 21, the front lenses 14 and 14A and the projection lens 40 in the above embodiment, the infrared light transmitting film is formed only on the front side. Alternatively, it may be formed on both the front surface and the back surface.

Further, in the above-described embodiment, the infrared light transmitting film non-forming region is formed around the outer periphery of the infrared light transmitting film, and the peripheral portion of the lens is made to emit white light so that the red light emission of the lamp is reduced. In the infrared light transmitting film, minute through holes, which are non-infrared light transmitting film non-forming regions, are dispersed and provided, and a small amount of white light is emitted from the vicinity of the center of the lens.
It may be configured to dilute the red emission of the lamp. Further, an infrared light transmissive film non-formation area is formed on the outer periphery of the infrared light transmissive film, and minute through holes which are the infrared light transmissive film non-formation area are dispersed and provided in the infrared light transmissive film. Then, the red light emission of the lamp may be reduced.

[0049]

As is apparent from the above description, according to claim 1, the red light emitted when the lamp is lit is reduced by the white light emitted from the peripheral portion of the lens and the white light slightly emitted from the vicinity of the central portion of the lens. As a result, the lamp does not appear to light red like before, so there is no risk that drivers and pedestrians will mistakenly recognize the lighting of the infrared light irradiation lamp as the lighting of the tail lamp or stop lamp, and it is safer for driving. Is secured.

When forming an infrared light transmitting film non-forming area on the outer periphery of the infrared light transmitting film, the portion corresponding to the infrared light transmitting film non forming area is masked and red by coating or vapor deposition. Since it is sufficient to form the external light transmitting film, the formation of the infrared light transmitting film non-forming region is easier than the case where the infrared light transmitting film non-forming region is formed in the infrared light transmitting film.

According to the second aspect, when it is desired to replace the transparent member (infrared light transmitting filter) having the infrared light transmitting film formed thereon, only the infrared light transmitting filter can be used without replacing other lamp components. Since it is only necessary to replace, the cost is low.

Further, since the transparent member is smaller than the lens, the number of the infrared light transmitting films to be formed (the number of the transparent members which are the members to be vapor-deposited in the vapor deposition furnace) is increased. Therefore, the cost for forming the infrared light transmitting film can be reduced.

According to the third aspect, since the infrared light transmitting film is formed directly on the lens, the lamp structure is not complicated as compared with the case where the infrared light transmitting film is formed on the transparent member, and moreover, the interior of the lamp. Since no heat is stored in the infrared ray transmitting film, thermal deterioration of the infrared light transmitting film is suppressed, and a stable amount of infrared light is guaranteed for a long period of time.

[0054]

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an infrared light irradiation lamp that is a first embodiment of the present invention.

FIG. 2 is a rear view of an infrared light transmitting filter which is a main part of the lamp.

FIG. 3 is a vertical cross-sectional view of an infrared light irradiation lamp that is a second embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of an infrared light irradiation lamp that is a third embodiment of the present invention.

FIG. 5 is a vertical sectional view of an infrared light irradiation lamp according to a fourth embodiment of the present invention.

FIG. 6 is a perspective view of a main part of an infrared light irradiation lamp according to a fifth embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view of an infrared light irradiation lamp that is a sixth embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view of an infrared light irradiation lamp that is a seventh embodiment of the present invention.

FIG. 9 is an exploded perspective view of a main part of the lamp.

[Explanation of symbols]

10A-10G infrared light irradiation lamp 12 lamp body 12a Valve insertion hole 13 engagement groove 14,14A Front lens 14a Edge of front lens 15 Cylindrical step which is a light distribution control step 16 Parabolic reflector 16A split reflector 16C ellipsoidal reflector 17 Multiple continuous reflective surfaces 18 Halogen bulb as a light source 20, 20A, 20B, 20C infrared light transmission filter 21 glass plate 22 Infrared light transmitting film 24A-24G Infrared light transmissive film non-formation area 30 lens holder 32, 32C stepped portion carrying a lens 32A, 32B Stepped portion carrying a filter 36,36A lens holding frame 40 Projection lens 40a Edge of projection lens 41 Projection lens flange S, S1 light room

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Claims (3)

[Claims] 1. A container-shaped lamp body, a lens that is assembled in a front opening of the lamp body and cooperates with the lamp body to define a lamp chamber, and a reflector provided inside the lamp body. A light source provided in front of the reflector, and an infrared light irradiation lamp for an automobile, comprising an infrared light transmitting film, wherein the outer periphery of the infrared light transmitting film and / or the infrared light transmitting film is provided. An infrared light irradiating lamp for an automobile, characterized in that an infrared light transmitting film non-forming region is provided. 2. The infrared ray for automobiles according to claim 1, wherein a transparent member is provided between the reflector and the lens, and the infrared light transmitting film is formed on the transparent member. Light irradiation lamp. 3. The infrared light irradiation lamp for an automobile according to claim 1, wherein the infrared light transmitting film is formed on the lens.